Unit Converter
Inches to Millimeters Converter
Convert inches (in) to millimeters (mm) instantly. Free, accurate, and browser-based — no signup, no ads in your way.
Instant resultExact formula shownConversion table included
Result0.5 in = 12.7 mm
How to convert inches to millimeters
1 in = 25.4 mm. Multiply the inches value by 25.4 to get millimeters.
Example: 30 in = 30 × 25.4 = 762 mm.
Inches to millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 8 | 203.2 |
| 10 | 254 |
| 12 | 304.8 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 30 | 762 |
| 40 | 1016 |
| 50 | 1270 |
| 60 | 1524 |
| 75 | 1905 |
| 100 | 2540 |
| 150 | 3810 |
| 200 | 5080 |
Convert the other way
Need mm to in instead? Use the dedicated Millimeters to Inches converter.
FAQ
How do I convert inches to millimeters?
1 in = 25.4 mm. Multiply the inches value by 25.4 to get millimeters.
How many millimeters are in one inche?
One inche (in) equals 25.4 millimeters (mm).
What is 15 in in mm?
15 inches equals 381 millimeters. Type any value into the converter above for an instant exact result.
Is this in to mm converter free?
Yes. Every Utiliora tool is free, open source, works in your browser, and never asks you to sign up.
Can I convert the other way, from mm to in?
Yes — use the Millimeters to Inches converter at /converters/mm-to-inches, or press the swap button in the converter above.